EP 0551744 B1 19980520 - Optical disc and method for manufacturing the same
Title (en)
Optical disc and method for manufacturing the same
Title (de)
Optische Scheibe und Verfahren zur Herstellung derselben
Title (fr)
Disque optique et sa méthode de fabrication
Publication
Application
Priority
JP 33180591 A 19911216
Abstract (en)
[origin: EP0551744A1] An optical disc includes a recording film formed on one surface of a disc-shaped plastics substrate having light transmission properties, and an antistatic film formed on the other surface of the substrate to which an optical beam is applied, in which the plastics substrate is made by injection molding and a U-shaped annular groove or ridge is formed on the whole circumference on the surface, a radius of which is a distance between the center and a joint position of an injection mold, and a method for manufacturing the same. <IMAGE>
IPC 1-7
IPC 8 full level
B05D 5/12 (2006.01); G11B 7/24 (2006.01); G11B 7/26 (2006.01); G11B 23/00 (2006.01)
CPC (source: EP KR)
G11B 5/74 (2013.01 - KR); G11B 7/24 (2013.01 - EP); G11B 7/26 (2013.01 - EP)
Designated contracting state (EPC)
DE FR GB IT NL
DOCDB simple family (publication)
EP 0551744 A1 19930721; EP 0551744 B1 19980520; CA 2085383 A1 19930617; CA 2085383 C 19971021; DE 69225575 D1 19980625; DE 69225575 T2 19981126; JP 2768862 B2 19980625; JP H05166226 A 19930702; KR 100261649 B1 20000715; KR 930014309 A 19930722
DOCDB simple family (application)
EP 92311468 A 19921216; CA 2085383 A 19921215; DE 69225575 T 19921216; JP 33180591 A 19911216; KR 920024313 A 19921215